Effect of chemical fertilizer and manure application on N2O emission from reed canary grassland in Hokkaido, Japan

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概要

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• We evaluated the effect of chemical fertilizer and manure applications on N2O emission from a managed grassland by establishing three treatment plots of chemical N fertilizer (chemical fertilizer), manure combined chemical N fertilizer (manure) and no N fertilizer (control) at the Shizunai Experimental Livestock Farm in southern Hokkaido, Japan. N2O fluxes from soils were measured by a closed-chamber method from May 2005 to April 2008. Soil denitrifying enzyme activity (DEA) in root-mat layer (0-2.5cm) and mineral soil layer (2.5-5cm) of each treatment plot was measured by an acetylene inhibition method after treatment with NO^[-]_[3]-N and glucose addition and neither NO^[-]_[3]-N nor glucose addition, respectively. Annual N2O emission ranged from 0.6 4.9 kg N2O-N ha^[-1]yr^[-1], with the highest observed in manure plot and lowest in control plot. Chemical fertilizer-induced emission factor (EF) (range: 0.85-1.32%) was significantly higher than manure-induced EF (range 0.35-0.85%). Denitrification potential of soil horizons was measured with addition of both NO^[-]_[3]-N and glucose, which was significantly higher in root-mat soil than that in mineral soil. Soil DEA in root-mat in NO^[-]_[3]-N addition with and without addition of glucose had a significantly positive correlation with soil pH (P < 0.05). Soil pH was significantly influenced by N source, which was significantly lower in chemical fertilizer plot than that in control and manure plot. For a fixed quantity of available N, the application of manure could result in higher N2O emission compared with chemical fertilizer owing to high soil pH values under manure application than under chemical fertilizer application.

• 社団法人日本土壌肥料学会の論文

著者

• Hata Hiroshi

  Field Science Center for Northern Biosphere, Hokkaido University

• Alexey Desyatkin

  北大院農

• Shimizu Mariko

  北大院農

• Hatano Ryusuke

  北大院農

• SHIMIZU Mariko

  Soil Science Laboratory, Graduate School of Agriculture, Hokkaido University

• MARUTANI Satoru

  Soil Science Laboratory, Graduate School of Agriculture, Hokkaido University

• DESYATKIN Alexey

  Soil Science Laboratory, Graduate School of Agriculture, Hokkaido University

• JIN Tao

  Soil Science Laboratory, Graduate School of Agriculture, Hokkaido University

• HATANO Ryusuke

  Soil Science Laboratory, Graduate School of Agriculture, Hokkaido University

• IIZUKA Natsumi

  Soil Science Laboratory, Graduate School of Agriculture, Hokkaido University

• Jin Tao

  Lab of Soil Science, Hokkaido University

• Hata Hiroshi

  Shizunai livestock farm, Hokkaido University

• Jin Tao

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Shimizu Mariko

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Hatano Ryusuke

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Iizuka Natsumi

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Marutani Satoru

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Alexey Desyatkin

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Hata Hiroshi

  Field Science Center For Northern Biosphere Agro-ecosystem Research Station Shizunai Livestock Farm

• Hata Hiroshi

  Hokkaido Univ. Hokkaido

• Desyatkin Alexey

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Hatano Ryusuke

  北大 大学院

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